| 16 |
|
.B octree |
| 17 |
|
.br |
| 18 |
|
.B "rtrace [ options ] \-defaults" |
| 19 |
+ |
.br |
| 20 |
+ |
.B "rtrace \-features [feat1 ..]" |
| 21 |
|
.SH DESCRIPTION |
| 22 |
|
.I Rtrace |
| 23 |
|
traces rays from the standard input through the RADIANCE scene given by |
| 37 |
|
This may be useful for programs that run |
| 38 |
|
.I rtrace |
| 39 |
|
as a separate process. |
| 40 |
< |
In the second form, the default values |
| 40 |
> |
.PP |
| 41 |
> |
In the second form shown above, the default values |
| 42 |
|
for the options (modified by those options present) |
| 43 |
|
are printed with a brief explanation. |
| 44 |
|
.PP |
| 45 |
+ |
In the third form, a list of supported features is sent |
| 46 |
+ |
to the standard output, one per line. |
| 47 |
+ |
If additional arguments follow, they are checked for presence in |
| 48 |
+ |
this list. |
| 49 |
+ |
If a feature includes subfeatures, these may be checked as well by |
| 50 |
+ |
specifying: |
| 51 |
+ |
.nf |
| 52 |
+ |
|
| 53 |
+ |
rtrace -features FeatName=subfeat1,subfeat2 |
| 54 |
+ |
|
| 55 |
+ |
.fi |
| 56 |
+ |
If any named feature or subfeature is missing, an error is |
| 57 |
+ |
reported and the program returns an error status. |
| 58 |
+ |
If all of the named features are present, a zero status is returned. |
| 59 |
+ |
.PP |
| 60 |
|
Options may be given on the command line and/or read from the |
| 61 |
|
environment and/or read from a file. |
| 62 |
|
A command argument beginning with a dollar sign ('$') is immediately |
| 260 |
|
and for creating valid Radiance picture files using the color output |
| 261 |
|
format. |
| 262 |
|
(See the |
| 263 |
< |
.I \-f |
| 263 |
> |
.I \-f* |
| 264 |
|
option, above.) |
| 265 |
|
.TP |
| 266 |
|
.BI -n \ nproc |
| 281 |
|
.I \-x |
| 282 |
|
setting, which forces a wait at each flush. |
| 283 |
|
.TP |
| 284 |
+ |
.BI -f \ source |
| 285 |
+ |
Load function and variable definitions from the file |
| 286 |
+ |
.I source |
| 287 |
+ |
and assign at the global level. |
| 288 |
+ |
This may be convenient for altering material appearance on a per-run basis. |
| 289 |
+ |
The usual set of library directories is searched based on the |
| 290 |
+ |
.I RAYPATH |
| 291 |
+ |
environment variable. |
| 292 |
+ |
These file definitions will override same-named variables |
| 293 |
+ |
and functions in "rayinit.cal". |
| 294 |
+ |
.TP |
| 295 |
+ |
.BI -e \ expr |
| 296 |
+ |
Set initial definitions from |
| 297 |
+ |
.I expr, |
| 298 |
+ |
which may include constant assignments with the ':' character. |
| 299 |
+ |
.TP |
| 300 |
|
.BI -dj \ frac |
| 301 |
|
Set the direct jittering to |
| 302 |
|
.I frac. |
| 705 |
|
divided by the given |
| 706 |
|
.I frac. |
| 707 |
|
.TP |
| 708 |
< |
.BR -ld |
| 708 |
> |
.BR \-ld |
| 709 |
|
Boolean switch to limit ray distance. |
| 710 |
|
If this option is set, then rays will only be traced as far as the |
| 711 |
|
magnitude of each direction vector. |
| 712 |
|
Otherwise, vector magnitude is ignored and rays are traced to infinity. |
| 713 |
|
.TP |
| 714 |
+ |
.BI -cs \ Ns |
| 715 |
+ |
Use |
| 716 |
+ |
.I Ns |
| 717 |
+ |
bands for spectral sampling rather than the default RGB calculation space. |
| 718 |
+ |
The maximum setting is controlled by the compiler macro MAXCSAMP, and |
| 719 |
+ |
defaults to 24. |
| 720 |
+ |
Larger values for Ns will be reduced to MAXCSAMP. |
| 721 |
+ |
.TP |
| 722 |
+ |
.BI -cw " nmA nmB" |
| 723 |
+ |
Set extrema to the given wavelengths for spectral sampling. |
| 724 |
+ |
The default is 380 and 780 nanometers. |
| 725 |
+ |
The order specified does not matter. |
| 726 |
+ |
.TP |
| 727 |
+ |
.BR \-co |
| 728 |
+ |
Boolean switch turns on spectral data output if selected. |
| 729 |
+ |
The default is to reduce spectral results to RGB, but see the related |
| 730 |
+ |
.I \-p* |
| 731 |
+ |
options, below. |
| 732 |
+ |
.TP |
| 733 |
+ |
.BI -pc " xr yr xg yg xb yb xw yw" |
| 734 |
+ |
Use the specified chromaticity pairs for output primaries and white |
| 735 |
+ |
point rather than the standard RGB color space. |
| 736 |
+ |
.TP |
| 737 |
+ |
.BR \-pRGB |
| 738 |
+ |
Output standard RGB values (the default). |
| 739 |
+ |
.TP |
| 740 |
+ |
.BR \-pXYZ |
| 741 |
+ |
Output standard CIE XYZ tristimulus values rather than RGB. |
| 742 |
+ |
.TP |
| 743 |
+ |
.BR \-pY |
| 744 |
+ |
Produce a single output channel corresponding to photopic luminance. |
| 745 |
+ |
.TP |
| 746 |
+ |
.BR \-pS |
| 747 |
+ |
Produce a single output channel corresponding to scotopic luminance. |
| 748 |
+ |
.TP |
| 749 |
+ |
.BR \-pM |
| 750 |
+ |
Produce a single output channel corresponding to melanopic luminance. |
| 751 |
+ |
.TP |
| 752 |
|
.BI -e \ efile |
| 753 |
|
Send error messages and progress reports to |
| 754 |
|
.I efile |
| 849 |
|
.SH AUTHOR |
| 850 |
|
Greg Ward |
| 851 |
|
.SH "SEE ALSO" |
| 852 |
< |
getinfo(1), lookamb(1), mkpmap(1), oconv(1), pfilt(1), pinterp(1), |
| 853 |
< |
pvalue(1), rcontrib(1), rsplit(1), |
| 852 |
> |
dctimestep(1), getinfo(1), lookamb(1), |
| 853 |
> |
mkpmap(1), oconv(1), pfilt(1), pinterp(1), |
| 854 |
> |
pvalue(1), rcalc(1), rcomb(1), rcontrib(1), rcrop(1), |
| 855 |
> |
rmtxop(1), rsplit(1), |
| 856 |
|
rpict(1), rtpict(1), rvu(1), vwrays(1), ximage(1) |
